Nevada Irrigation District Centennial Reservoir Project ... · Opinion of Probable Construction...
Transcript of Nevada Irrigation District Centennial Reservoir Project ... · Opinion of Probable Construction...
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Nevada Irrigation DistrictCentennial Reservoir Project
Draft Conceptual Engineering Report
July 12, 2017
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Agenda
ØAlternative Selection
ØDam Foundation and Rock Borrow Area Characterization
ØDam and Appurtenant Works
ØConstruction Schedule and Cost Estimate
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Selection of RCC Dam at Axis 2
– Considered roller compacted concrete (RCC) dam and concrete facerockfill (CFR) dam at Axes 2 & 6• RCC dam alternative at Axis 2 has lowest expected construction cost of
alternatives.• RCC dam could be constructed in less time than a CFR dam.• RCC dam more capable of withstanding flood overtopping during
construction than CFR dam.• Axis 2 would have a 3-ft lower reservoir elevation than for Axis 6 to store
110,000 AF.o Lower reservoir elevation would reduce level of inundation around reservoir
– RCC dam at Axis 2 carried forward to design.CFR DamRCC Dam
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July 5, 2017Presentation Title
Proposed Reservoir andDam Axis Location
Rock Borrow Area
Dam Axis
Water Surface El. 1885
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Dam Foundation and Rock Borrow Area– Summary of site investigation activities
– Geotechnical conditions at Dam Site
– Geotechnical conditions at South RockBorrow Area
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Summary of Field Investigations
– Three phases of investigations:• Phase I: 2015• Phase II: 2015• Phase III: 2016
– Geologic mapping
– Seismic refraction surveys
– Core borings
– Hydraulic conductivity testing
– Bore hole geophysical surveys
– Rock strength testing
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Regional Geologic Map
Upper Lake Combie Complex rocks: volcanic rock:basalt, locally metamorphosed;dipping slightly to the west
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Historical Seismicity and Regional Fault Map
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Geologic Mapping• Mapping of rock outcrops, alluvium and
landslides
• Evaluation of photo lineaments
• Developed plans for seismic line andboring locations
• Confirmed regional geologic mapping
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Independent Evaluation of Potential for Active Faulting
Conclusions
– Lack of positive evidence of active faulting at Axis 2site.
– Stratigraphy near Axis 2 site appears to be consistentacross the river.• Absence of vertical separation of contacts supports conclusion that
faulting is not present.
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Site Exploration Map – Seismic Refraction Surveys
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Surface Geophysical Surveys
– 15 seismic refractionsurvey lines at Axis 2 site
– Close confirmation withbore hole data
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Geotechnical Drilling Investigation – Axis 2
• 16 core boringso 2 verticalo 14 inclinedo Up to 254 feet deepo Total drilling 2715 ft
• Water pressure (packer)testing
• Televiewer and caliperlogging
• Downhole seismicvelocities
• Rock strength testing
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Boring CB-15 on Bear River
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Site Exploration Map - Borings
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Geotechnical Profile - Axis 2
CB-12
CB-1CB-17
CB-2
CB-16CB-16A
CB-13
CB-3 CB-4
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Detail of Exploratory Boring “Stick Logs”
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CB-1, 120.0 – 133.9 ft.
CB-1, 133.9 – 147.5 ft.
Core Boring Sample: south (left) abutment
Ø Weathering and fracturing decrease with depth
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Optical Televiewer Log: CB-13, 69.5 – 85.4 ft.
Rock Core: CB-13, 69.5 – 85.4 ft.
Rock Core and Televiewer Log: north (right) abutment
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Findings• Hard basaltic rock• Favorable topographic conditions• Close to the dam site area
Potential Rock Borrow Area Investigation• Geologic mapping• Seismic refraction surveys• 5 core borings totaling 585 ft• Downhole seismic velocities• 2 piezometers• Rock strength testing• Durability testing
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Geotechnical Sections South Borrow Area
CB-B2
CB-B1
CB-B4
CB-B5 CB-81
CB-B2
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Geotechnical Investigation Findings –Foundation Conditions
– Depth to weathered rock generally less than 20 ft.
– Weathered rock found to depths of 100 – 130 ft. at somelocations
– All borings encountered less fractured rock with depth
– Evaluation of significant joint sets and shears indicates alack of persistence between adjacent bore holes
– Hydraulic conductivities mostly decrease with depth andwith decreasing fracture intensity
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Geotechnical Investigation - Conclusions
– Confirmed no fatal flaws at Dam Axis 2 site
– Hard volcanic and metavolcanic rock is suitable damfoundation
– Evidence for lack of active faulting along mappedlineaments at site
– Potential rock borrow area present on north side ofreservoir, upstream of dam
– Further investigations needed to develop final design
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Excavation Plan
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Plan of Dam
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Dam Profile
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Maximum Spillway Section
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Non-Overflow Sections
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Outlet Works
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Spillway Bridge
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Instrumentation Plan
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River Diversion Concept
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Construction Site Layout – 1 (On-site Rock Borrow)
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Construction Site Layout – 2 (Bear River Quarry Borrow)
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Basis of Construction Schedule
– Work performed up to 6 days per week, 2 shifts per day
– No overly restrictive constraints on trucking materials to thesite
– Dam foundation excavation: 15,000 cy per week
– Foundation grouting (drilling and grouting): 600 lf per weekfor each drill rig and grout plant.
– RCC construction: 16,000 cy per week
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Construction Schedule (Conceptual)
Ø Estimated 2.5-year construction duration
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Opinion of Probable Construction Cost (2017 dollars)
WBSCategory Description Category Total
Category % ofTotal
A Mobilization and Demobilization $18,737,000 7.3%
B Site Development $21,497,000 8.4%
C River Diversion $2,600,000 1.0%
D Dam Foundation $41,862,000 16.3%
E RCC, Facing Concrete and Gallery $136,325,000 53.3%
F Spillway and Dam Crest $12,766,000 5.0%
G Spillway Bridge $2,340,000 0.9%
H Outlet and Intake Structures and Pipe $14,759,000 5.8%
I Miscellaneous Civil $3,224,000 1.3%
J Instrumentation and SCADA $1,950,000 0.8%
Total OPCC $256,059,000 100.0%
Estimated Range - Low (-15%) $217,685,000Estimated Range - High (+20%) $307,320,000
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Thank You